Hello!
I have been casually working on Raymond for the past three days and I figured a little insight might be useful to folks who want to do this too!
*You DO get more of the villager type that you don't currently have! (I have NO smugs so I've been finding every smug under the sun, I am down to only eight I haven't met yet, Raymond being one of them)
*You DO still occasionally see other villagers too but its less than the personality you're missing for sure! ( I saw Moe, saddest moment of my personal search for sure, gosh darn soft spot I have for lazies I swear).
My Method!
1. Go to the first of the next month; In this case, May
2. Check in with Isabelle, if she doesn't say anything about a camper, leave to the main menu, shut the game off, and go to the next day.
3. Repeat this within a 15 day time span until a villager shows up (usually they will show up within those fifteen days, I've only had it once where they didn't, I'll explain what to do if they don't.)
4. Visit the campsite to see which villager it is, check in with your villagers if you'd like
*(pull weeds because boy will they get arduous if you don't take the time to do so now.)
5. If its not the villager you want, save, close the game again, and TT seven days out.
6. Check in with Isabelle, if she doesn't say anything about a camper, close the game, go back to the 1st and start again.
**FOR FIFTEEN DAYS WITHOUT A CAMPER : just go back to the 1st after the fifteen days are up and start the process again, easy ovo
When you Find One!
1. When you find the camper you want make sure to save the first time you speak to them, and every time you win a game with them after, just in case you end up with the move-in game.
2. Play the move-in game so long as you saved before it, if you win and they pick a villager you don't want to move out, or if you lose, shut the game off, come back in, play again.
3. They will pick a different random villager each time.
4. Keep doing this ridiculously difficult task until they pick the villager you want to see leave and viola : D
Fifteen days is a lot more manageable than going through an entire month or year or what have you trust me, and like I said, I've only ever had it ONCE where I made it through the fifteen without a camper so... I definitely recommend this over any other method
Good Luck!
-^ ^-